Is anyone running an auxiliary tank in truck bed that holds 60 to 80 gal diesel. How do you feed main tank, gravity or pump is pump external or built to pump directly to main tank? Looking to install tank that weighs less than 1000 lbs full. About 60X19X19.

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Mine has an internal fuel pump, which is plumbed into the main fuel filler neck. Found my tank on craigslist for $100. If cost is an issue, you might consider a large fuel tank from a scrapped OTR truck.

I run the RDS 60gal with toolbox, it is the same height as the frame rails, so no interference while turning. You didn't say longbed or short bed, it makes a difference, might not be enough clerance for the hitch and tank with a short bed. I also run the RDS fill setup, that gravity fills the main tank through the filler neck, it has a checkvalve that prevents overfilling. The only thing that I have found is that the computer doesn't like the constant fill and the fuel gauge goes to empty after around 300 miles, then it will go back to normal after the auxilary tank is empty and the main tank starts to go down.
Bought both through Northern Tool and Supply.
Frank

Thanks for all the help. Seems like Aluminum tanks have best auxiliary tank for me 80 gal is 60x18x18 will work perfect on my 6.5' bed

I've used the RDS 90 gallon with their gravity fill system and it worked fine.

I now have a 65 gallon tank and I'm using the Aluminum Tanks & Tank Accessories (ATTA) Freedom Fill which uses a pump and electronics to keep the main tank at 3/4 full. This is a nice system and worth checking out.

Hard to see what you are driving and pulling by the little pic, but I have to ask if you have thought about your available payload capacity on top of your pin or hitch wt, plus the other total cargo wt.? That fuel tank sure would be a lot of extra payload.

I also use a RDS 95 gal tank with gravity flow, best thing I ever added. Always leave the gravity flow open and just add fuel to the "big" tank. As was said above, make sure you have the capacity in your weights for such things.

Hard to see what you are driving and pulling by the little pic, but I have to ask if you have thought about your available payload capacity on top of your pin or hitch wt, plus the other total cargo wt.? That fuel tank sure would be a lot of extra payload.

The best bar none, but more costly, would be from TransferFlow. They make bigger under-bed replacement tanks, ordinary in-bed auxiliary tanks, and toolbox/fuel tank combos of various sizes.

Gasoline is a whole 'nother problem. I gave up on a legal auxiliary tank for my F-150 and instead installed the 36-gallon gas tank from a 4x4. 36-gallons total is not great, but much better than the 26-gallons I began with.